Refrigeration cycle device

A refrigeration cycle device comprising:

• a compressor that compresses and discharges a refrigerant;
• a heat exchanger configured to dissipate heat from the refrigerant discharged from the compressor;
• a decompression valve configured to decompress the refrigerant flowing out of the heat exchanger;
• an evaporator configured to evaporate the refrigerant decompressed by the decompression valve;
• and
• a variable throttle provided in a refrigerant passage that connects the evaporator and the compressor, the variable throttle being configured to be capable of changing a passage cross-sectional area of the refrigerant passage, wherein
• the heat exchanger includes:
• a plurality of first tubes through which the refrigerant discharged from the compressor flows,
• a plurality of second tubes through which the refrigerant from the first tubes flows, wherein the first tubes and the second tubes are stacked in a stacking direction;
• and
• a first header tank provided at one end side in a longitudinal direction of the plurality of first tubes and the plurality of second tubes such that the refrigerant from the first tubes flows into the second tubes through the first heater tank;
• a second header tank provided at an another end side in the longitudinal direction of the plurality of first tubes and the plurality of second tubes;
• a tank interior space of the second header tank is partitioned into a first space section communicating with the plurality of first tubes, and a second space section communicating with the plurality of second tubes,
• the first space section and the second space section of the second header tank communicate with each other through a communication portion provided in the second header tank, and
• the second header tank includes an iris diaphragm valve configured to open or close the communication portion.